The complexity of secularism

http://history-and-evolution.com/whee4th/chap6_1_1.htm: Discussions of secularism have been misdefined around the issue of atheism, which is very misleading, to say the least.
The discussion of the early modern (up to 1800) given in this section from WHEE shows the complexity of the meaning of ‘secularism’ the number of issues rapidly expands to include a whole universe of study, and this discussion here is merely a partial shortlist.